Power shovel



- March 1 0, 1925- P. BURKE POWER SHOVEL 2 Sheets-Sheet 1 Filed Jan.

TOQNEY Wm M WITNESS ES E W March 10, 1925- 1,529,394 P. BURKE POWER SHOVEL Filed Jan. 18, 1.9.25 2 Sheets-Sheet 2 WITNESSES R INVENTOR WWW? Pa; 151M @Lfw ATTORNEY Patented Mar. .10, '1925.

UNITED STATES 1 9 3 PATENT OFFICE.

PAUL BURKE, OF GREEN BAY, WISCONSIN, ASSIGNOR TO NORTHWEST momma COMPANY, OF GREEN BAY, WISCONSIN, A CORPORATION OF WISCONSIN.

POWER SHOVEL.

Application filed January 18, 1928. Serial Ho. 613,360.

To all whom it may concern:

Be it known, that I, PAUL BURKE, a citizen of the United States, and. resident of Green Bay, in the county of Brown and State of Wiscon 'n, have invented a certain new and usefu Shovels, of which the following is a specification.

This invention relates to power-shovels, and more particularly "to that type of shovel in which the hoisting-rope or cable is also used for thrusting the dipper into the material to be excavated.

One of the objects of this invention is to improve and simplify power-shovels of the rope-thrusting type and to provide for the thrusting of a twopart or double stick dipper handle without the usual gear mechanism or rack and pinions, or auxiliary driving apparatus of any kind, and to arrange the ropes or lines for controlling and actuating the dipper so as to avoid the use of drums and to permit the ropes to be efliciently guided over the sheaves.

A further object of the invention is to provide a shovel in which the two-part hoisting line for the dipper has a bight in end-thrust engagement with the two-part dipper handle.

The invention further consists in the several features hereinafter set forth and more particularl defined by claims at the conclusion hereof:

In the drawings; Fig. 1 is a side elevation view of a power-shovel embodying the invention; Fig. 2 is a plan view thereof, part1 in section; Fig. 3 is a sectional view throng tine guiding mechanism for the dipper hanin the drawings the numeral 5 designates the boom, which may be of any suitable construction, vertically pivotally attached at its lower end to a rotating base 6 of the machine, said base being'of well-known construction. A hoisting-drum 7 and an auxiliary drum 8 are mounted on the base 6 in any suitable manner and driven from the prime mover (not shown) on the base. The drums 7 and 8 may be of any well-known construction equipped with clutches and brakes to control their operation. The boom is adapted to be raised or lowered in various ositions of vertical adjustment by any wellown means, such as a cablei9, shown in dotted lines, connecting pulleys 10 at the Improvement in Power outer ends of the boom to parts on the rotating base. The boom shown is of the box girder type with the two part stick or dip-- per handle 11 working ad acent its sides 12.

The shipper shaft 13 issecured' to opposite sides of the boom and the guiding means 1 for the stick is loose on said shaft and preferably swings behind it. This guiding means consists of a saddle-block 14 for each section of the stick, said block 14 having an arm 16 carrying a shaft or stud 17 on which a guide roller 18 is loosely mounted. Each art of the stick slides between the flat surace 19 of the saddle-block immediately adjacent the shaft 13*:and the roller 18, and may have a metal covering 20.

The dip r or shovel 21 carried by the stick may of any suitable construction.

The inward-thrusting cable 22 is connected to the drum 8 and directly to the dip and dip er handle, as at 23, and is guidfd interme iate its ends by sheaves 24 and 25. The sheave 24 is mounted above the boom rearwardly of i the shipper shaft and the sheave 25 is loosely mounted on the shipper shaft. The cable run over the sheaves 24. and 25 is substantially alined with the drum and with the dipper stick so as to minimize wear. It will be understood that the lower plate of the boom is suitably slotted to per mit the free passage of the cable 22 for the various positions assumed by the dipper handle.

Spaced sheaves 26 and 27 are mounted on a shaft 28 on the outer end portion of the boom and a padlock sheave 29 is mounted on the dipper transversely or at right angles to the axis of the sheaves 26 and 27. A. sheave 30 is loosely mounted on the shipper shaft 13 between the guide for one part of the handle and the adjacent side of the boom and a collar 31 is loosely mounted on said shaft 13 between the guide for one part of an; handle and the adjacent side of the The two parts of the dipper handle are connected together at their upper end portions by a member 32 anda sheave 33 1$ and is anchored to the collar 31 and hence dead-ended onthe boom, through the swinging anchorage connection thus provided. This reeving of the cable produces a twopart line hoist portion for hoisting the dipper and a two-part line portion in endthrust engagement with the dipper handle for crowding the dipper, and the cable 34 has its run over the sheave 33 maintained in the same relation thereto irrespective of the angular position of the dipper handle with respect to the boom, and the arrangement further makes it unnecessary to have a double wrap of cable.

\Vith the construction above described, when the drum 8 is prevented from turning by its brake, thereby holding the line or cable 22, and the line 34 is pulled in, the dipper moves in the arc of a circle of which the dipper shaft is the center. If it is desired to crowd further into the bank or to move the dipper farther out, as in loading a Wagon, the braking effect on the line 22 is released slightly, whereupon the line 34, working over the upper end of the dipper stick, upon being pulled in, forces or thrusts the dipper stick outward. Conversely, if it is desired to move the dipper farther in and toward the boom, releasing the brake on line 34 and pulling in on line 22 by the operation of drum 8 produces this effect. Thus, by the proper manipulation and control of the lines 22 and 34 through the rotation or braking of the drums 7 and 8, any desired swinging or thrusting movement of the dipper and its handle may be effected. Furthermore, by the sheave arrangement above described, the thrusting action is substantially as great as the lifting action on the dipper. It will also be noted that the thrusting action on the dipper is proportional to the load upon the dipper and to the resistance and weight of the material it'encounters during digging.

It will be further noted that by swinging the dipper handle back of the shipper shaft the arran ement of the thrusting cables is facilitatecf and that the arrangement of the guides for said cables prevents their interference with the swin ing of the dipper.

I desire it to be un erstood that this invention is not to be limited to any specific form or arrangement of parts exce t in so far as such limitations are specific in the claims.

What I claim as my invention is:

.1. In an excavating shovel, the combination of a boom, :1 di per and a divided dipper handle mounte thereon to swing and shift with respect thereto, a. connection between the parts of said handle above the boom, a dipperhoisting-ancl-thrusting cable having a bight connected with the dipper for hoisting and a bight in end-thrust engagement with said connection for thrusting the dipper outwardly, and separate means for moving said dipper inwardly. 7

'2. In anexcavating shovel, the combination of a boom, "a dipper and a divided dipper handle mounted thereon to swing and shift with respect thereto, a connection between the parts of said handle above the boom, a dipper-hoisting-and-thrusting cable having a bight connected with the dipper for hoisting and a bight'in end-thrust engagement with said connection for thrusting the dipper outwardly, and a cable running between the parts of the handle for moving the dipper inwardly.

3. In an excavating shovel, the combination of-a boom,"a shipper shaft, a dipper and a divided dipper handle mounted to swing and shift with respect to the boom, a sheave on said shipper shaft, a cable anchorage on said shipper shaft, a connection between the parts ofsaid handle above the boom and carrying a sheave having its'axis disposed at an angle to that of the shipper shaft, a dipper-hoisting-and-thrust'in cable having a bight connected with the dipper for hoisting and a part extending over said sheave on the shipper shaft, the sheaveon' the dipper handle and connected to said anchorage for thrusting the dipper outwardly another sheave on said shipper shaft and between the parts of said handle, and a cable extending over said last-named sheave and connected to the dipper and dipper handle for moving them inwardly.

4. In an excavating shovel, the combination of a boom, a shipper shaft, a dipper and a divided dipper handle, a shipper shaft mounted on the boom, guiding means for the parts of said handle mounted on said shaft outside the boom, a sheave on said shaft between said boom and the guide means for one part of the handle, a swinging cable-anchorage on said shaft between said boom and the guide means for the otherv part of the handle, a sheave operativelyconnected to the parts of said dipper handle above the boom, a diper-hoisting-and-thrusting cable having a ight connected for hoisting the dipper and a. part extendin over said'sheave on the ship(per shaft, t e sheave on the dipper han lo and connected to said anchorage for thrusting the dipper outwardly, and a cable working between the parts of the handle for moving the dipper inwardly.

- PAUL BURKE. 

